To be fair I think the Glastonbury guys are masters of stage changeovers at this point - did you see how much stuff Camilla Cabello had for a early evening Other stage slot
I went to the Manchester show on a late and free ticket from a friend - new very little about her - but good show will be listening to more in the future.
I do get that point if view to be honest.
However the small grip for that would be you will have acts playing 3rd or 4th down put on a stella show with a huge enough crowd.....we could talk about any of those really in those slots. The difference is if they are booked last instead you've got more time to set a stage up for things that don't need to be quickly changed for a next act.